US1969067A

US1969067A - Method of and apparatus for making belts

Info

Publication number: US1969067A
Application number: US633449A
Authority: US
Inventors: Walter B Freeman
Original assignee: BF Goodrich Corp
Current assignee: Goodrich Corp
Priority date: 1932-09-16
Filing date: 1932-09-16
Publication date: 1934-08-07
Anticipated expiration: 1951-08-07

Description

1934- w. B. FREEMAN 1,969,067

IETHOD OF AND APPARATUS FOR MAKING BELTS Filed Sept. 16. 1932 2 Sheets-Sheet l 1 mm 62 .51 -49 ZZ/ZEE ,Bfiseman j idlr 'r Aug. 7, 1934. w. B. FREEMAN METHOD OF AND APPARATUS FOR MAKING BELTS Filed Sept. 16. 1932 2 Sheets-Sheet 2 IIIIIII inf-2b).?

Patented Aug. 7, 1934 x rArE r OFFICE METHOD 'or-ann'maaarus FOR mama I I y I .nnurs 2 Walter B. Freeman, Cuyahoga an... Ohio, as-

signor to The ..B. -F. Goodrich Company, New York, N. Y., a corporation of New York Application September 1 1932. Serial No. exam. v

- 9 Claims. (Qua-4) This. invention relates to a method ,of and apparatus for making power transmission belts and relates especially to the manufacturepf belts comprising a fibrous non-elastiqcore embedded in a bodyof elastic rubber compound. The principal objects of the invention are to. provide a methodand apparatus whereby accurate alignment pfcthe fibrous cores within the rubber body may be accomplished and to provide a method and apparatus whereby operations on a plurality of belts may be simultaneously conducted. v

Other objects will appear from the following description, reference being made to the accompanying drawings. I

In the drawings: Fig. 1 is an end elevation of the 'belt forming apparatus with a band.0f belt forming material.

thereon, part of the band being broken away, Fig. 2 is a side elevation of the apparatus v Fig. 1, parts templates the provision of a pair of beltcore supporting drums 10 and 11 spaced from each other in parallelism and each provided with aligned grooves 12 for supporting a plurality of non-extensible belt cores 13 in spaced arrangement. 15 horizontally journaled in bearings 16 and 17 in a pedestal 18. The other drum 11 is rotatably mounted on a shaft 19 supported by a crosshead 20, slidably mounted on a pair of rods 21 and 22 horizontally disposed at 90 degrees to shaft 16 and having their opposite ends supported by the pedestal 18 and a second pedestal 23 spaced therefrom. A feed screw 24, arranged parallel to rods 21 and 22, and journaled in' pedestals18 and 23 engages a threaded lug 25, carried by cross-head 20, and is provided with a handwheel 26, whereby "the drum 11 ma be adjusted with respect to drum 10.

Power from any convenient source suchas an electric motor .(not shown) is applied by means of a belt 27 to a pulley 28 mounted on a shaft 29 journaled in pedestal 18 and parallel to shaft 15. Shaft 29has fixed thereon a'pair of. sprock-, ets 30 and 31 from which apair-of clutch members 32 and 33, rotatably mounted on a counter shaft 53, and provided with'fixed sprocket wheels 34 and-35, are driven by chains 36 and 37. A sprocket 38 mounted on shaft 53 engages a chain 1 tioii.

Drum 10 is mounted on a, shaft fixed to shaft 15. A clutch member 41 is slidably .39 which in turn engages a sprocket wheel 40 mounted on shaft 53 and feather keyed thereto.

may be operated to engage either the clutch 'member 32 or 33. The. upper end of yoke 42 is forked to engagebetween a pair of

collars

44 and 45, slidably mounted on a rod 46, fixed to pedestal 18. A pair ofcompression cofl springs 47 and 47 'encircle the rod 46 and each impinges a wall of the pedestal and one of the collars 44- and 45, the arrangement being such that the yoke 42 and clutch member 41 are normally heldin a central or disengaged posi- A pedal lever 481s axed to shaft 43 and may be depressed, thereby compressing spring 47 and engaging clutch member 41 with clutch member 32 and causing drum 19 to rotate at a slow speed,

sprockets

30 and 34 being of such respective sizes as to cause a reduotion'in speed between shafts 29 and 53. On release of pedal 48, shaft 53 will be disengaged from clutch member 32.

A shaft 49 is journaled 'in pedestal 18, parallel to shaft 43' and has fixed thereto a pedal lever 50 and a gear 51. A gear 52 fixed to, shaft 43 engages gear 51, the arrangement being such that when pedal lever, 50 is depressed spring 47 is .compressed and clutch member 41 engages clutch member 33 causing drum 10 to rotate u at a higher speed, sprockets 35 and 37 being of such respective sizes as to cause an increase in speed between shafts 29 and 53. On release of pedal 50, shaft 53 will be disengagedfrom clutch member 33. 9

An arm 54, fixed to pedestal 18 and overhanging the drum 10, supports a fluid pressure cylinder 55 in which a piston 56 is adapted to be raised or lowered by fluid admitted to the cylinder through

ports

57 and 58. A piston rod 59 attachedto piston 56 has a cross-head 60 ata tached to its upper end which in turn is attached to the .upper ends'of a pair of

rods

61 and 62, vertically slidablein arm 54. The'lower extremities of

rods

61 and 62 arev formed to provide bearings for a horizontally disposed shaft 63 which has a roller 64 mounted thereon, the arrangement being such that when fiuid isfrom 72 is rotatably mounted on rod. 65 between

collars

66 and 67 and supports a knife bar 73 in which a plurality of knife blades 74 are mounted in spaced relation facing the drum 10. A handle 75 fixed to arm 72 provides a convenient means of forcing the blades toward or retracting them from the drum, the arrangement being such that the stops 70 and 71 limit the travel of the blades.

Where more than one of the non-extensible cores 13 are to be incorporated in a single belt the grooves 12 in the drum 10 are arranged in sets with knife clearance grooves 76 between sets and the knife blades 74 are spaced to correspond with the arrangement of knife grooves.

In practicing the method of .this invention a plurality of endless non-extensible cores 13 are arranged to encompass the drums 10 and 11 and seated in the grooves 12 provided therefor.

' The spacing of the drums may then be adiusted to tension the cores as'by adjustment of the hand wheel 26 of the device Just described. The roller 64 is brought into engagement with the cores 13 on'the drum 10 and a sheet of unvulcanized rubber materialis fed between the cores 1s and theroller 64, the drum 16 being rotated" for this purpose, preferably at a slow speed. The roller 64 causes the sheet material to I be pressed into adhesive engagement with the bores 13 which become embeddedtherein. Successive 'convolutions of sheet material are applied until a body of such material of the proper thickness has been applied as indicated by the numeral 77. The knife blades 74 are now pressed against the material during continued rotation of the drumto sever the band of material between sets of cores 13 and in alignment with the clearance grooves 76. The drum 10 may be retated at a higher velocity during the cutting operation if desired. v

The provision of the grooves in the drums 10 and 11 assures accurate spacing of the cores with each other and with the knife blades and there fore assures accurate location of the cores with I as respect to the margins of the belts and prevents cutting of the cores due to mis-alignment. The

' adjustment of the drums assures the cores being properly tefisioned' when the rubber is applied and the grooves in the drums permit location of the cores at one side of the belt. The separated belt bodies are slacked for removal from the drums by rotation of the screw 24 and afterremoval from the drums they are covered with fabric or other covering material 80' and are enclosed in molds and subjected to vulcanization preferably in molds adapted to press the belts into trapezoidal form as shown in Fig. 5. Prior to the molding operation the belt bodies are I turned inside out to bring the cord cores to the "outer periphery of the belt.

' I claim:

" 1. The method of making endless transmission belts which comprises supporting a pmrality of endless cores in spaced relation, tensioning the cores, applying a layer of moldable composition to the outer faces of said cores,

and slitting the resulting endless band of material between. cores to provide a plurality of endless belt bodies.

2. The method of making endless transmission belts which comprises supporting a plurality of endless cores in groups of parallel cores, ap-

plying alayer of moldable composition to the outer faces of said cores, slitting the resulting endless band of material between groups of drum being grooved cores to provide a plurality of endless belt bodies each comprising a plurality of cores, applying a cover to each belt body, and vulcanizing the belts so formed.

3. The method of making endless transmission belts which comprises supporting a plurality of endless cores in spaced relation, tensioning the cores, adhesively applying a layer of binding 5. The method of making endless transmis- Y sion belts which comprises supporting a plurality of endless cores in. spaced relation, adhesively applying a layer of binding material to the outer faces of said cores, slitting the endless band so formed between coresto provide a plurality of belt bodies, covering said bodieswith a cover, reversing said bodies and vulcanizing the beltsso formed.

6. Apparatus for .makingendless transmission belts, said apparatus comp'risinga pair of spaced drums for supporting a plurality of belt cores, said drums being grooved to determinate- 'ly position the cores in spaced relation, means for driving one of .said drums, means for forming a sheet of plastic materialover the exposed portions of the cores, and means for slitting the band of material so formed between adjacent cores. 4

7. Apparatus for making endless transmission belts, said, app ratus comprising a pair of 'spaced drums for supporting aplurality of belt cores, said drums being grooved to determinately space said cores, means for driving one of saiddrums, pressing means for engaging the material on said last named drum', and slitting means adapted to slit material overlying said cores on said drum between. adjacent cores, said drum being grooved, to provide clearance spaces for receiving said slitting means.

' 8. Apparatus for I making endless transmission belts, said apparatus comprising a pair of spaced drums for supporting a pluralityof belt cores, said drums being grooved to determinately space said cores, means for driving'one of said drums, means for applying sheet material in adhesive contact with a pluralityoi cores'on said drums, means for tensioning said cores, and

slitting means for severing the applied material A between groups of. cores to provide belt, bodies, said driven drum being formedto clear said slitting means. I

9. Apparatus for making endless transmission belts, said apparatus comprising a pair of coresupporting drums I grooved to determinatelyv space a plurality of belt cores, means for driving one of said drums, means for applying sheet material to said cores and to partially embed the cores-in said material, and means for slitting said material between groups of cores to provide a plurality of belt bodies, said driven to clear said slitting means,

WALTER B. FREEMAN.